No probs novocaine, I really wasn't offended, honest, I just didn't understand (and didn't notice the sticking out tongue, sorry).
I suppose you mean one of those gert big Hiltis, etc?
The reason I bought the Bosch is 'cos the local tool dealer (a place for "profis", not the local DIY Emporium) highly recommended it. I don't use it all that often but am very pleased with it 'cos as said, the concrete here is really HARD, and a normal half inch drill with masonry bit just won't look at it. I was dead chuffed when the local leccy (also a "profi") said he has one too, and likes it.
BTW, the Bosch may weigh "only" 2 Kg, but after I've done a few overhead holes it feels more like 50 Kg, never mind 5! Never mind, nearly finished now (thank Gawd)
AES
P.S: Apologies to the OP for the thread drift.